Also programmers are the owners of their means of production. Most artists too, but for some reasons they are often paid very badly if they aren't get excessively popular by accident.
I think there were a lot of changes since the beginning of the industrial revolution and if knowledge and abilities increasingly keep being the primary ressource of production, the theory could fit at some point.
At my last job I wrote a driver for a proprietary framework to talk to closed hardware units, which made lots of money. I could not have done this without the company's license as a developer for the framework, or without the protocol specification for the hardware units. In this case, the company I worked for owned the means of production, not me, so it's perhaps unsurprising that I got a very tiny cut of the fruits of my labour.
Edit: or maybe not rarer, but the costs of machine and license become smaller compared to your wage.